JPH1198735A - Rotor of dynamo-electric machine, and manufacture of rotor of dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rotor of a dynamo-electric machine of easy constitution such that a magnet inserted into a slot of the rotor does not fall, even if external force is applied to it in the direction of the rotary shaft of the rotor, and a manufacturing method of the rotor. SOLUTION: The adhesive injected beforehand into a slot 14b of a rotor core 14 shifts in the direction of an insertion hole 20a of a magnet 16, being pushed away by the magnet 16 inserted into the slot 14b. The sectional form of the insertion hole 20a of the plate 20, to which the slot 14b ranges exhibits a taper form where the bottom widens more than the top, and the adhesive pushed away into the insertion hole 20a and hardened engages with the top press plate 20, and regulates the shifting in the direction of a rotary shaft 12c of a rotor 10 in the magnet 16, and fixes and retains the magnet 16 in the slot 14b and prevents its slip out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a rotary electric machine and a method for manufacturing the rotor for the rotary electric machine, and more particularly to a rotor for a rotary electric machine and a rotor for the rotary electric machine which can prevent the magnet from falling off from the rotor with a simple structure. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a rotor 100 used in a permanent magnet type synchronous rotating machine (rotating electric machine) such as a motor or a generator is used.
As shown in FIG. 6, a rotor core 102 as a yoke formed by laminating a plurality of plate-shaped electromagnetic steel sheets 102a processed into a predetermined shape by press working or the like,
The rotor 104 is constituted by a magnet 104 inserted into a slot 102b formed in the rotor core 102, and a shaft 106 for outputting or inputting a rotational motion is fixed to the center of rotation. The rotor 100 is inserted into a stator capable of forming a rotating magnetic field, and when used as a motor, the magnet 104 is sequentially attracted to the rotating magnetic field that is rotated by the supplied power, and the rotor 100 is driven to rotate.
When the rotor 100 is rotated by an external force, a rotating magnetic field is generated on the stator side to function as a generator.

Incidentally, the magnet 104 inserted into the slot 102b of the rotor core 102 is, for example,
As shown in Japanese Patent Application Laid-Open No. 8-256440, it is fixed by an adhesive. When fixing the magnet 104 with an adhesive, the magnet 104 is inserted into the slot 102b, and then the adhesive is injected from the opening end of the slot 102b to bond the inner wall surface of the slot 102b to the surface of the magnet 104.

[0004] By firmly fixing the magnet 104 without playing in the slot 102b, damage to the magnet 104 can be prevented. In addition, since the magnet 104 and the rotor core 102 are firmly fixed, it is formed on the stator side and can accurately follow the rotating magnetic field and perform accurate rotation driving.

[0005]

However, when the conventional rotating electric machine having the rotor 100 is mounted on a moving body that moves in an arbitrary direction, for example, an automobile or a robot, the magnet 104 is turned by the turning motion of the moving body. In some cases, an external force may be applied in a direction to pull out of the slot 102b. Then, when the external force exceeds the shearing force of the adhesive, the magnet 104 falls off the rotor 100, and there is a problem that the rotating electric machine does not function normally. In particular, the adhesive is weak in durability against environments such as high temperature and high humidity, and it is difficult to stably hold the magnet 104 for a long period of time.

As described above, the magnet 104
When the adhesive is injected from the opening end side after the insertion into the slot 102b, it is difficult to inject the adhesive so as to spread all over the magnet 104, and it is impossible to check the injection state. There was a problem of lack of reliability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to securely and permanently fix a rotor magnet by a simple configuration and an easy assembling operation to prevent the magnet from falling off. It is an object of the present invention to provide a rotor for a rotating electrical machine and a method for manufacturing the rotor for the rotating electrical machine.

[0008]

In order to achieve the above object, the present invention is directed to a yoke that is rotatable about a rotating shaft, and extends around the outer periphery of the yoke along the rotating shaft. A rotor of a rotating electrical machine including a yoke having a slot formed therein and a magnet inserted into the slot together with an adhesive, wherein at least one of the inner wall of the slot or the surface of the magnet is concave along the rotation direction of the rotating shaft. A ridge or a ridge is formed, and the adhesive hardened in the slot engages with the ridge or the ridge to regulate the movement of the magnet in the rotation axis direction.

According to this structure, the adhesive which has entered the space formed in the rotational direction of the rotor formed by the concave ridges or the convex ridges and hardened becomes a protrusion in the diameter direction of the rotor.
The magnet is mechanically held against external force in the direction of the rotation axis of the rotor. Further, by providing a sufficient adhesive in the space, the adhesive force of the adhesive is also improved, and the magnet can be prevented from falling off.

[0010] In order to achieve the above object, the present invention provides a retainer in which the yoke of the rotor is formed by laminating a plurality of flat plates having a slot forming opening, and having an insertion hole whose uppermost surface is continuous with the slot. It is formed by pressing with a member,
The ridge portion is formed in an insertion hole of the holding member.

In order to achieve the above object, the present invention is characterized in that the convex portion of the rotor has a tapered shape in which the lower end of the pressing member is wider than the upper end.

Here, the convex ridge portion is formed such that the opening end of the pressing member is smaller than the inside of the pressing member, and the cross-sectional shape of the pressing member is, for example, stepped or tapered by the convex ridge portion. Take shape.

[0013] According to this structure, the opening end of the slot is covered by the cured adhesive, and enters the space formed by the concave and convex portions extending in the rotational direction of the rotor, and is cured. The adhesive thus formed becomes a protrusion in the diameter direction of the rotor, mechanically holds the magnet against external force in the direction of the rotation axis of the rotor, and prevents the magnet from falling off.

In order to achieve the above object, the present invention provides a yoke rotatable about a rotation axis, the yoke having a slot extending along the rotation axis on an outer peripheral portion thereof. And a magnet inserted into the slot, comprising: a step of injecting an adhesive into the slot; and a step of displacing the adhesive accumulated at the bottom of the slot upwardly from the slot. And a step of hardening the displaced adhesive to form a hardened piece, and a concave ridge formed on at least one of the inner wall of the slot or the surface of the magnet along the rotation direction of the rotation shaft. Or controlling the movement of the magnet in the rotation axis direction by engaging with the ridge portion.

Here, the slot is formed slightly larger than the outer dimensions of the magnet so that the adhesive previously injected can be moved above the slot when the magnet is inserted.

According to this configuration, the adhesive accumulated at the bottom of the slot is lifted by the magnet while being pushed down to the upper end of the slot, so that the entire space around the slot can be reliably filled with the adhesive. Confirmation is also easy. Further, the adhesive that has entered the space formed in the rotational direction of the rotor formed by the concave ridges and the convex ridges and hardened becomes a projection piece in the diameter direction of the rotor, and the magnet against external force in the direction of the rotational axis of the rotor. Holds mechanically to prevent falling off.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings. 1A and 1B show a rotor 1 of a rotating electric machine according to the present embodiment.
0 is an external perspective view and a sectional view. The shaft 12, which is the rotation axis of the rotor 10, has a flange 12a for partially holding a rotor core 14 as a yoke.
As described above, the rotor core 14 is formed by laminating a plurality of thin annular electromagnetic steel plates 14a punched by press working or the like. In addition, the flange 12
a slot 14 formed in the rotor core 14 to stably support the electromagnetic steel plate 14a.
The lower end holding plate 18 for supporting the magnet 16 inserted in the position b is disposed. Then, an annular electromagnetic steel plate 14a is sequentially laminated on the flange 12a and the lower end holding plate 18.

After laminating a predetermined number of electromagnetic steel sheets 14a, an annular upper pressing plate 20 constituting a part of the rotor core 14 is disposed on the uppermost electromagnetic steel sheet 14a. Further, on the inner peripheral side of the upper end holding plate 20, the upper end holding plate 20 is pressed from the upper surface side to compress the laminated electromagnetic steel plates 14a, and the electromagnetic steel plates 14a themselves are pressed.
, A pressure plate 22 for compressing the laminated electromagnetic steel sheets 14a is arranged. In the case of the present embodiment, the pressure plate 22 does not generate a pressing force by itself, and the pressure plate 22 is pressurized by a pressure tool or the like.
The caulking portion 12b formed at the upper end of the flange 12a is pushed down toward the pressing plate 22, and the pressing state of the pressing plate 22 is maintained to push down the upper end holding plate 20. As a result, pressure adhesion of the electromagnetic steel sheet 14a is realized. In the case of the present embodiment,
Although the upper end pressing plate 20 and the pressing plate 22 are separate components, the pressing force may be maintained by the caulking portion 12b so as to press and adhere the electromagnetic steel plate 14a as an integrated component.

As a part of the rotor core 14, the upper end pressing plate 20 disposed on the upper surface of the electromagnetic steel plates 14a closely adhered to each other is bonded to the slots 14b formed by stacking the electromagnetic steel plates 14a having the slot forming openings. Hole 20 for inserting agent and magnet 16
a is formed. This insertion hole 20a is shown in FIG.
As is apparent from FIG. 3, a plurality of slots 14 are formed along the outer periphery of the rotor core 14 and the slots 14
b is continuous. Also, as shown in FIG. 1B, the cross section of the shaft 12 including the rotation axis 12c is
a has a tapered shape in which the contact side is widened. Therefore, the upper end side of the insertion hole 20a is at least
6 and becomes wider toward the inside (lower end side) of the insertion hole 20a. That is, the upper end portion of the upper end pressing plate 20, which is a part of the slot, has a band-shaped convex portion along the rotation direction of the rotation shaft.

A feature of the present embodiment is that a magnet has a ridge in the slot, the ridge is engaged with the hardened adhesive injected into the slot, and the magnet is inserted and arranged in the slot. Of the rotating shaft in the axial direction.

FIG. 2 shows a method of manufacturing the rotor according to the present embodiment.

First, as a first step, as shown in FIG. 2A, a lower end holding plate 18 is mounted on a flange 12a of a shaft 12, and an electromagnetic steel plate 14 is sequentially placed thereon.
a is stacked in a predetermined number.

Further, an upper end holding plate 20 is arranged on the upper surface of the laminated electromagnetic steel plates 14a, and a pressing plate 22 is arranged on the inner peripheral surface of the upper end holding plate 20. Then, by applying a pressing force to the pressing plate in the axial direction of the shaft 12 by a pressing tool or the like (not shown), the caulking portion 12b is caulked to the pressing plate 22 side while keeping the lamination state of the electromagnetic steel sheets 14a in close contact with each other. The pressing force of the pressing plate 22 is maintained, the close contact state of the electromagnetic steel plate 14a is maintained, and the yoke as the rotor core 14 is assembled.

Subsequently, as a second step, a predetermined amount (a predetermined amount will be described later) of an adhesive 26 is injected into the slot 14b of the assembled rotor core 14 by a dispenser 24 or the like. The adhesive 26 is, for example, an epoxy-based adhesive or a silicone-based adhesive, and preferably has a viscosity of about 3000 to 90000 cp (centipoise). If the viscosity is at this level, the magnet 16 is inserted without leaking from the gap between the laminated electromagnetic steel sheets 14a and pushing the adhesive 26 in the next step.
Can be easily inserted.

Next, as shown in FIG. 2C, the magnet 16 is inserted into the slot 14b by an insertion tool using an air cylinder or the like. At this time, as described above,
The adhesive 26 previously injected is pushed away by the insertion of the magnet 16 and travels along the gap (for example, about 0.1 mm) between the inner wall of the slot 14b and the magnet 16 in the direction of the insertion hole 20a. Ascending while filling the gap. As shown in FIG. 2 (d), the amount of the adhesive 26 injected in FIG. 2 (b) is set at a predetermined position inside the slot 14b (for example, the electromagnetic steel plate 14b on which the upper end of the magnet 16 is laminated). To the position corresponding to the uppermost layer of the upper end holding plate 20).

After the insertion of the magnet 16 is completed, the adhesive 26
To cure. When the adhesive 26 is epoxy-based, for example, a curing process is performed at 150 ° C. for about 30 minutes.

As shown in FIG. 2D, the adhesive 26 cured inside the insertion hole 20a of the upper end holding plate 20 is
In order to form a lid having a tapered shape (a projecting piece projecting in the diameter direction of the rotor) expanding toward the magnet 16, in addition to the adhesive force of the adhesive 26, the taper of the insertion hole 20 a and the hardening of the adhesive 26. Since the magnet 16 is held by the mechanical engagement force of the piece, the magnet 16 is prevented from dropping out of the insertion hole 20a (slot 14b) except that the cured shape of the adhesive 26 is destroyed, and the rotor is rotated in the rotation axis direction. The magnet 16 can be held in the slot 14b even when the external force is applied. Also, the insertion hole 20a
The adhesive 26 cured around the magnet 16 absorbs the external force in the rotation axis direction because the adhesive 26 cured by
No external force acts directly on 6, and the magnet 16 is fixed in the slot 14b satisfactorily and permanently.

Therefore, the holding and fixing of the magnet 16 can be continued even when the adhesive force to the magnet 16 is reduced due to the deterioration of the adhesive 26 over time. Therefore, the magnet 16 does not rattle in the slot 14b, the torque of the rotating magnetic field generated in the stator (not shown) can be efficiently transmitted, and the rotation of the rotor 10 can be accurately followed.

The magnet 16 is inserted in the slot 14b.
Since there is no movement, the coating for preventing corrosion formed on the surface of the magnet 16 is not damaged, and demagnetization or the like due to corrosion of the magnet 16 does not occur.

According to the method of assembling the rotor 10 shown in FIG. 2, the adhesive 26 previously injected into the slot 14b is used.
Is guided to the insertion hole 20a side while being pushed away by the magnet 16, so that almost no air bubbles remain between the magnet 16 and the slot 14b, and the adhesive 26 can be reliably spread over the entire surface of the magnet 16. The reliability of the adhesive application can be improved, and the heat generated by the magnet 16 when the rotor is driven can be satisfactorily radiated through the adhesive layer.

FIG. 3 shows another embodiment of the ridge portion formed on the rotor core 14. In the example of FIG. 3, the cross-sectional shape of the ridge 20 a formed on the upper end holding plate 20 has a rectangular stepped shape. In this case, the insertion hole 20a can be easily formed by milling or the like, and the engagement with the adhesive 26 cured by the rectangular step can be firmly performed.

FIG. 4 shows the slot 14b and the magnet 16
9 shows another example of the engagement form. In this example, a concave ridge portion 30 is formed on the side surface of the magnet 16. Also in this case, the adhesive 26 previously injected into the slot 14b is pushed away with the insertion of the magnet 16 into the slot 14b, enters the concave ridge 30, and hardens there. Then, the adhesive 26 becomes a hardened piece integrated with the slot 14b, restricting the movement of the magnet 16 in the rotation axis direction of the rotor 10, and obtaining the same effect as the example shown in FIGS. it can.

FIG. 5 shows the slot 14b and the magnet 16
5 shows still another example of the engagement form. In this example, the concave streak portion 32 is formed in the laminated portion of the electromagnetic steel sheet 14a. Also in this case, the adhesive 26 previously injected into the slot 14b is pushed away with the insertion of the magnet 16 into the slot 14b, enters the recess 32, and hardens there. Then, the adhesive 26 becomes a hardened piece integrated with the magnet 16, and the magnet 16 is
The movement in the direction of the rotation axis can be restricted, and the same effect as the example shown in FIGS. 1 to 4 can be obtained.

Since the electromagnetic steel sheet 14a is formed by press working or the like, oil that adheres during working is attached, and it is often difficult to sufficiently remove the oil. In that case, the adhesive force between the slot 14b and the adhesive 26 may decrease. On the other hand, the magnet 16 does not adhere with oil during molding, and can be easily cleaned. Therefore, in the case of FIG. 5, the adhesive 26 is completely and firmly bonded to the surface of the magnet 16. As a result, there is a large resistance in the direction in which the magnet 16 falls off,
The magnet 16 is completely prevented from falling off.

As shown in FIGS. 4 and 5, the magnet 1
6 and the example in which the concave streak portions 30 and 32 are formed in the laminated portion of the electromagnetic steel sheet 14a, the upper end holding plate 20 as shown in FIGS. , It is possible to further hold a strong magnet.

In this embodiment, when the ridges or recesses are formed in the slots or the magnets, they are formed on the inner and outer circumferences of the rotor. If it can be ensured, the same effect can be obtained in either one.

The rotor structure described in the present embodiment is an example, and an adhesive is filled in a convex or concave portion extending in the rotation direction of the rotor, and the cured adhesive and the convex portion are filled. Alternatively, if the structure is such that the magnet is held mechanically by engaging with the concave ridge portion, the same effect as that of the present embodiment can be obtained.

[0038]

According to the present invention, the adhesive which has entered the space extending in the rotational direction of the rotor formed by the concave ridges or the convex ridges and hardened becomes the diametrical projection of the rotor,
With a simple configuration, the magnet can be mechanically held against external force in the rotation axis direction of the rotor. Also, by providing a sufficient adhesive in the space, the adhesive strength of the adhesive can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of a rotor of a rotating electric machine according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a method for manufacturing a rotor of the rotating electric machine according to the embodiment of the present invention.

FIG. 3 is an explanatory view illustrating the shape of another protruding portion formed on the upper end pressing plate of the rotor of the rotary electric machine according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating a shape of a concave portion formed in a magnet of the rotor of the rotary electric machine according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating a shape of a concave portion formed on a laminated electromagnetic steel plate of the rotor of the rotary electric machine according to the embodiment of the present invention.

FIG. 6 is an explanatory view illustrating a structure of a rotor of a conventional rotating electric machine.

[Explanation of symbols]

10 rotor, 12 shaft, 12a flange, 1
2b caulking part, 12c rotating shaft, 14 rotor core,
14a Magnetic steel plate, 14b slot, 16 magnet, 18 lower end holding plate, 20 upper end holding plate, 20a insertion hole, 22 pressing plate.

Claims (4)

[Claims] A yoke rotatable about a rotation axis, the yoke having a slot extending along the rotation axis on an outer peripheral portion thereof; and a magnet inserted into the slot together with an adhesive. In a rotor of a rotating electrical machine, a concave or a convex portion is formed on at least one of an inner wall of the slot or a surface of a magnet along a rotation direction of the rotating shaft, and the adhesive hardened in the slot is formed by the adhesive. A rotor for a rotating electric machine, wherein the rotor is engaged with a ridge or a ridge to restrict movement of a magnet in a rotation axis direction. 2. The rotor according to claim 1, wherein the yoke is formed by stacking a plurality of flat plates having a slot forming opening, and pressing an uppermost surface thereof by a pressing member having an insertion hole connected to the slot. A rotor for a rotating electric machine, wherein the ridge portion is formed in an insertion hole of the holding member. 3. The rotor according to claim 2, wherein the protrusion has a tapered shape in which a lower end of the pressing member is wider than an upper end of the pressing member. 4. A rotating electric machine, comprising: a yoke rotatable about a rotating shaft, a yoke having a slot extending along the rotating shaft on an outer peripheral portion thereof, and a magnet inserted into the slot. A method of manufacturing a rotor, comprising: a step of injecting an adhesive into the slot; a step of inserting a magnet into the slot while pushing down the adhesive accumulated at the bottom of the slot above the slot; and a step of displacing the adhesive. Is cured to form a cured piece, and at least one of the inner wall of the slot or the surface of the magnet is engaged with a concave portion or a convex portion formed along the rotation direction of the rotating shaft, so that the magnet has a rotating shaft direction. A method for manufacturing a rotor of a rotating electrical machine, comprising: a step of restricting movement.